20.4 Cluster Advisors

This section describes the expression-based Cluster Advisors.

Cluster Data Node Data Memory Getting Low

Advises when the amount of Data Memory configured for the data nodes starts to run low. Database inserts will start to fail is all of the memory is consumed.

Default frequency 00:05:00

Default auto-close enabled no

Cluster Data Node Has Been Restarted

To perform useful work, the cluster data nodes must be up-and-running continuously. It is normal for a production system to run continuously for weeks, months, or longer. If a data node has been restarted recently, it may be the result of planned maintenance, but it may also be due to an unplanned event that should be investigated.

Default frequency 00:05:00

Default auto-close enabled no

Cluster Data Node Index Memory Getting Low

Advises when the amount of Index Memory configured for the data nodes starts to run low. Database inserts will start to fail is all of the memory is consumed.

Default frequency 00:05:00

Default auto-close enabled no

Cluster Data Node Redo Buffer Space Getting Low

Advises when the redo buffers start to fill up.

Default frequency 00:05:00

Default auto-close enabled no

Cluster Data Node Redo Log Space Getting Low

Advises when the redo log spaces start to fill up.

Default frequency 00:05:00

Default auto-close enabled no

Cluster Data Node Undo Buffer Space Getting Low

Advises when the undo buffers start to fill up.

Default frequency 00:05:00

Default auto-close enabled no

Cluster Data Node Undo Log Space Getting Low

Advises when the undo log spaces start to fill up.

Default frequency 00:05:00

Default auto-close enabled no

Cluster Data Nodes Not Running

Indicates how many data nodes are not running.

Default frequency 00:05:00

Default auto-close enabled no

Cluster DiskPageBuffer Hit Ratio Is Low

Advises when the hit-rate for the DiskPageBuffer falls below a threshold. May happen temporarily after restarting one or more data nodes. This is the average ratio since the last sample period.

Default frequency 00:05:00

Default auto-close enabled no

Cluster Has Stopped

Indicates a cluster has completely stopped.

Default frequency 00:02:00

Default auto-close enabled no